Fun Time! Acme Klein Bottles!

Do you need a zero-volume bottle? Are you searching for a one sided surface? A container that is larger on the inside than it is on the outside? Get a Acme Klein Bottle!

 As their website States, "At last, Acme has conquered topological and engineering frontiers to manufacture genuine glass Klein Bottles. These are the finest closed, non-orientable, boundary-free manifolds sold anywhere in our three spatial dimensions."